Q: Q: Thumping sounds while driving over sharp bumps

asked by on

I have a high-mileage car with approximately 150,000 miles on it. It has an automatic transmission. It's been making some noises in the front end of the car on the left side. These thumping sounds occur when I hit a sharp bump during driving. Bumps are not the issue, but only sharp ones would cause the noise. At the shop, they had the struts replaced as they thought that was making the noise. It didn't help however. The noise can be heard only from the inside of the car. I went to the dealer and had the strut bushings and top links replaced, as they were bad. I had the alignment checked as well. It was fine. I checked every part I could, including bolts and lower ball joints as well as the exhaust. There are no loose parts either. The car steering is fine. The sound is still noticeable. Besides sharp bumps, the sound is also heard if I drive slowly over a sharp speed bump, making the noise at the end of the speed bump. It sounds like something heavy. Do you have any idea what could be making this thumping noise? Thanks.

The only part you did not mention (and the most likely cause of the problem) is the inside lower control arm bushings are bad. I would also check the steering gear mount bushings for excessive wear. Both of these bushings would be felt through the floor when hitting bumps. Have the bushings and lower ball joint checked for any looseness or rubber cracks and replace as needed. A certified mobile mechanic from YourMechanic can diagnose and repair these problems as needed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Q: Thumping sounds while driving over sharp bumps

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Doesn't pick up speed

Hi There, There are a number of things that may cause the car to hesitate when accelerating such as low fuel pressure, a dirty or faulty mass air flow sensor, clogged or dirty fuel injectors, a faulty throttle position sensor...

Q: When applying the gas my car jerks when accelerating

What you are describing is often a sign of low transmission fluid or a faulty transmission control solenoid. As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer...

Q: How much would it cost to replace a motor for my Ford Windstar 2000?

Billing question sent to CS for cost of replacing the engine, performing a tune-up, replacing the coil packs, and fixing an oil pan leak.

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...